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 Integrate Lua with C++

Integrate Lua with C++

By : Wenhuan Li
4.5 (2)
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 Integrate Lua with C++

Integrate Lua with C++

4.5 (2)
By: Wenhuan Li

Overview of this book

C++ is a popular choice in the developer community for building complex and large-scale performant applications and systems. Often a need arises to extend the system at runtime, without recompiling the whole C++ program. Using a scripting language like Lua can help achieve this goal efficiently. Integrate Lua to C++ is a comprehensive guide to integrating Lua to C++ and will enable you to achieve the goal of extending C++ programs at runtime. You’ll learn, in sequence, how to get and compile the Lua library, the Lua programming language, calling Lua code from C++, and calling C++ code from Lua. In each topic, you’ll practice with code examples, and learn the in-depth mechanisms for smooth working. Throughout the book, the latter examples build on the earlier ones while also acting as a standalone. You’ll learn to implement Lua executor and Lua binding generator, which you can use in your projects directly with further customizations. By the end of this book, you’ll have mastered integrating Lua into C++ and using Lua in your C++ project efficiently, gained the skills to extend your applications at runtime, and achieved dynamic and adaptable C++ development.
Table of Contents (18 chapters)
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Free Chapter
1
Part 1 – Lua Basics
4
Part 2 – Calling Lua from C++
8
Part 3 – Calling C++ from Lua
12
Part 4 – Advanced Topics

Working with Lua table functions

For our Lua executor, we want to call table functions with the same level of support as calling global functions. Similar to call and vcall, we can define two functions named tcall and vtcall that call table functions and return a single value and a list of values respectively.

We need to add two more pieces of information to the new C++ member functions – namely, the following:

  • The table name, which is obvious
  • Whether we should pass the self argument to the table function

More on the latter point:

  • When the table function does not refer self and is used like C++ static member functions, we do not need to pass self
  • When the table function refers self and is used like C++ member functions, we need to pass self

Let’s implement the code to reinforce what we have just talked about.

Implementing table function support

In LuaExecutor.h, add the following declarations:

class LuaExecutor
{
public...

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